can't see the forest for the trees
US /kænt si ðə ˈfɔrɪst fɔr ðə triːz/
UK /kænt si ðə ˈfɔrɪst fɔr ðə triːz/
1.
to be unable to understand a situation clearly because you are too involved in too many small details or problems
:
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He's so focused on minor issues that he can't see the forest for the trees.
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Sometimes you need to step back and look at the bigger picture, otherwise you'll can't see the forest for the trees.